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Intel 4040

The Intel 4040 was the successor to the Intel 4004. It was introduced in 1974.

New Features

Interrupt
Single Step

Extensions

Instruction Set expanded to 60 instructions
Program memory expanded to 8K bytes
Registers expanded to 24
Subroutine stack expanded to 7 levels deep

New Support chips

4201 - Clock Generator
4308 - 1K byte ROM
4207 - General Purpose byte Output port
4209 - General Purpose byte Input port
4211 - General Purpose byte I/O port
4289 - Standard Memory Interface (replaces 4008/4009)
4702 - 256 byte UVEPROM
4316 - 2K byte ROM
4101 - 256 4-bit word RAM

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